Sure, but I already figured it out, with some help form a cc user named Nowayfra. (http://www.creativecrash.com/forums/dynamics-amp-effects/topics/interpreting-the-position-of-a-particle-collision--2/posts/306216)

Here is the file (http://www.mrwolfy.com/uploads/particleCollisionTest.mb.zip), before I fixed it. Paste (replace) the code below into the only expression in the scene to repair. I commented the line that was giving me trouble below.

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